cWhich of the following statements concerning Ras proteins is FALSE?
a. They are inactivated when phosphorylated.
b. They are G proteins.
c. They are active when bound to GTP.
d. They are activated by tyrosine kinase receptors.
e. They include MAP kinases.
A
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Altering the three-dimensional structure of an enzyme might
A. change the amount of energy needed for a reaction. B. prevent the substrate from binding the enzyme's active site. C. change the type of substrate that binds the enzyme's active site. D. change the type of product produced in the reaction. E. allow the reaction to occur at a faster rate.
The microbiology laboratory receives a nasopharyngeal specimen. The technologist fails to report the direct Gram stain and inoculates the sample onto routine culture media including blood agar, chocolate agar, and MacConkey agar. The discrepancy is:
a. there is no discrepancy. b. the microbiologist failed to report the di-rect Gram stain. c. the microbiologist failed to report the di-rect Gram stain and inoculated unneces-sary media. d. the microbiologist inoculated unnecessary media.
. A fetus born earlier than ___ weeks is
considered premature. a. 22 b. 26 c. 30 d. 33 e. 37
Currently ____________ is/are thought to have been the genetic material of the earliest cells.
A. proteins B. DNA C. RNA D. amino acids